Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libcopyreg.tex b/Doc/lib/libcopyreg.tex
index 9816bc9..7dabf42 100644
--- a/Doc/lib/libcopyreg.tex
+++ b/Doc/lib/libcopyreg.tex
@@ -1,4 +1,4 @@
-\section{Standard Module \sectcode{copy_reg}}
+\section{Standard Module \module{copy_reg}}
 % Note that the label is a little off; the underscore causes LaTeX to
 % yell & scream.
 \label{module-copyreg}